Note: This is a season long Spotter Guide, so actual entry list on a race by race basis may vary. Hard copies of this guide are also available at the track from the IMSA Support Paddock. Note, since Rd1 #25 has moved from Platinum to Gold class which is not shown on the printed guide.

At races where a WeatherTech/Continental event takes place, a combined guide featuring all series will be available on the IMSA WeatherTech page.

Thanks to IMSA for partnering with the guide If you get a few seconds, please thank IMSA on Twitter. Without their support, there would be no guide.

The Porsche GT3 Cup Challenge USA Spotter Guide is produced by Andy Blackmore Design with assistance from IMSA.

Andy Blackmore Design offers a full range of Creative Services for the Automotive and Motorsport Industry including livery designs,vehicle styling and builds and team identity. Clients include Nissan, McLaren, Porsche, Turner Motorsport, TAG Heuer, IMSA, Falken and Hankook.

The Spotter Guide series, created by Andy, are the largest collection of online spectator guides available worldwide.

The 2015 Le Mans Spotter Guide saw over 140,000 unique downloads.

TenTenths hosts SpotterGuides.com and started their forum in 1998 with the aim of providing the most comprehensive set of motorsport discussion forums on the World Wide Web. Per month they displayed roughly 1.3M content pages in 200,000 visits from 40,000 unique visitors.